Effects of Random Phase Shifts and Carrier Drift on the Resolution Properties of Linear Step Frequency Pulse Trains

摘要

A FORTRAN program using fast Fourier transforms has been written to calculate and plot the ambiguity function of a uniform linear step frequency pulse train with random initial phases and carrier frequency drifts. The effects of random phases and frequency drifts are studied in two stages. First, the initial phases are allowed to assume any value with equal probability in ranges of 0 to 20 degrees and 0 to 180 degrees while the frequency drifts are zero. Secondly, the phases are fixed at zero and carrier frequency drifts up to 0.1% and 1.0% are set. In each case, the ambiguity surface is shifted along the doppler axis with the effect being more pronounced for carrier frequency drifts. The effects on the half power width of the central lobe for 10 test cases for each phase and frequency range appear negligible for a two pulse train. Keywords: Theses; Subroutines. (Author)